Methyl substitution effect on aggregation-induced delayed fluorescence luminogens

Two tailor-made new aggregation-induced delayed fluorescence luminogens are constructed. The effect of methyl substitution sites on the luminescence behaviors is systematically evaluated. Efficient blue non-doped and doped organic light-emitting diodes are fabricated based on these emitters, furnishing high external quantum efficiencies of 14.3% and 30.4%, respectively.